[go: up one dir, main page]

US4393750A - Brake booster - Google Patents

Brake booster Download PDF

Info

Publication number
US4393750A
US4393750A US06/278,134 US27813481A US4393750A US 4393750 A US4393750 A US 4393750A US 27813481 A US27813481 A US 27813481A US 4393750 A US4393750 A US 4393750A
Authority
US
United States
Prior art keywords
movable wall
low
brake booster
casing
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/278,134
Other languages
English (en)
Inventor
Wilfried Wagner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ITT Inc
Original Assignee
ITT Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ITT Industries Inc filed Critical ITT Industries Inc
Assigned to ITT INDUSTRIES, INC. reassignment ITT INDUSTRIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WAGNER, WILFRIED
Application granted granted Critical
Publication of US4393750A publication Critical patent/US4393750A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/567—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of the casing or by its strengthening or mounting arrangements

Definitions

  • the present invention relates to a brake booster for automotive vehicles comprising a low-pressure casing which is sealingly subdivided into a low-pressure chamber and a working chamber by an axially movable wall, a reinforcement tube extending axially through the low-pressure casing having its ends secured to the two transverse end walls of the low-pressure casing and sealed relative to the movable wall, a mechanically actuatable control valve to connect the working chamber to the low-pressure chamber or to atmosphere, the control valve being enclosed in an axially movable housing which via a push rod communicates with an actuating piston of a master cylinder fastened to the low-pressure casing on the transverse end wall adjacent to the low-pressure chamber, and communicates via a force-transmitting device with the movable wall, the force transmitting device extending through recesses of the reinforcement tube in the area of the working chamber as disclosed in copending U.S. application of H. Seip, Ser. No. 238,797, filed Feb. 27, 1981, assigned to the
  • a light-weight construction in addition to a shortest possible overall length are aimed at in brake boosters for automotive vehicles.
  • the force which develops during brake actuation and which is transmitted from the master cylinder onto the point where the brake booster is fastened to the automotive vehicle, for example, to the splashboard will no longer be transmitted via the low-pressure casing, but via a central reinforcement tube according to more recent proposals.
  • a force-transmitting device which extends through recesses of the reinforcement tube.
  • recesses may be arranged in the area of the low-pressure chamber of the brake booster as disclosed in U.S. copending application of J. Belart, Ser. No. 141,830, filed Apr. 21, 1980, now U.S. Pat. No. 4,347,779, issued Sept. 7, 1982 assigned to the same assignee as the present application.
  • a difficulty is encountered in this construction since the recesses have to be placed outside the axial area which is overridden when the wall moves by the seal between the movable wall and the reinforcement tube, which can, for instance, be constructed as a rolling diaphragm. Otherwise, special covers or the like will have to be provided for these recesses to prevent the seal from being damaged.
  • the force-transmitting device is composed of a sleeve connected to the control valve housing and formed integrally therewith, from which sleeve extend radial ribs through the recesses of the reinforcement tube to establish a connection with a hub member of the movable wall.
  • the length of the reinforcement tube is required to be greater than the double power stroke of the movable wall, which results in a comparatively large overall length of the brake booster.
  • an object of the present invention to provide an improved brake booster of the type referred to hereinabove having a straightforward construction which is less susceptible to interferences as well as a shortest possible overall length.
  • a feature of the present invention is the provision of a brake booster for automotive vehicles comprising: a low-pressure casing having a longitudinal axis; an axially movable wall disposed in the casing in a coaxial and transverse relationship with the axis to subdivide the casing into a low-pressure chamber and a working chamber; a mechanically actuatable control valve to connect the working chamber to a selected one of the low-pressure chamber and atmosphere, the control valve being disposed in an axially movable control valve housing disposed coaxial of the axis in communication with a master cylinder piston actuating push rod; a force-transmitting sleeve having a plurality of longitudinal slots disposed in the casing coaxial of the axis, one end of the sleeve being connected to the housing and the other end of the sleeve being connected to the movable wall; and a reinforcement tube extending coaxial of the axis through the casing having an outside diameter less than the inside diameter of the slee
  • This construction obviates the need for longitudinal slots in the reinforcement tube, the length of the slots being defined by the power stroke of the movable wall and the slots thereby influencing the overall length of the brake booster.
  • the longitudinal slots whose length depends on the power stroke of the movable wall are arranged at the force-transmitting sleeve. Since the force-transmitting sleeve moves together with the wall, there will be no difficulties encountered by the longitudinal slots possibly getting in the area of the axially movable seal.
  • the recesses of the reinforcement tube are thereby formed by the space between radial extensions by which the reinforcement tube is fitted to the end wall. Upon movement of the movable wall, the transmitting sleeve will slide across the reinforcement tube and will also override an area of the reinforcement tube which represents a portion of the movable seal towards the movable wall.
  • the end wall close to the working chamber includes a central dome which encloses the control valve housing and a part of the transmitting sleeve in the inactivated position. A particularly short overall length of the brake booster is thereby achieved.
  • the transmitting sleeve includes a radial collar engaging behind the movable wall so that a positive force-transmitting engagement is provided between the movable wall and the transmitting sleeve without particular additional components. Since, in this arrangement, there will occur no high tension in the movable wall, the latter is allowed to be made of plastics resulting in a further reduction in weight.
  • control valve housing is sealed relative to the reinforcement tube by means of a pleated bellows, which is particularly suitable in this case, because the control valve housing is no longer placed within the reinforcement tube in the inactivated position.
  • FIG. 1 is a longitudinal cross-sectional view of a brake booster in accordance with the principles of the present invention
  • FIG. 2 is an enlarged sectional view illustrating the connection of the transmitting sleeve to the movable wall of the brake booster of FIG. 1;
  • FIG. 3 is an enlarged partial cross-sectional view of the spacer ring of the brake booster of FIG. 1;
  • FIG. 4 is a view of the spacer ring from the left-hand side.
  • the brake booster shown in FIG. 1 includes a low-pressure casing 1 which is subdivided into a working chamber 3 and a low-pressure chamber 4 by an axially movable wall 2. Extending axially through the low-pressure casing 1 is a reinforcement tube 5 whose ends are fastened to the two transverse end walls 6 and 7 of the low-pressure casing 1.
  • reinforcement tube 5 is connected to end wall 6 and a non-illustrated master cylinder of the brake unit by means of thread bolts 8.
  • reinforcement tube 5 includes radial extensions 9 which pass over into screw-in eyes 10 extending axially and communicating with end wall 7 and a non-illustrated splashboard of the automotive vehicle by means of thread bolts 11.
  • the axially movable wall 2 comprises a diaphragm plate made of plastics, between whose outer circumference and the low-pressure casing 1 a rolling diaphragm 12 is arranged as a seal.
  • a control valve 14 actuatable by a piston rod 13 is located outside the end of reinforcement tube 5 close to working chamber 3, in a central dome 15 of end wall 7 and includes a control valve piston 16 which is connected to the piston rod 13 and which will open valve openings in a control valve housing 17 in such a manner that working chamber 3 will communicate with low-pressure chamber 4 in the rest position shown in FIG. 1.
  • Low-pressure chamber 4 communicates with work chamber 3 through opening 30 in tube 5, the interior of tube 5, axial passage 31, radial passage 32 past valve member 34 in the position illustrated, chamber 33 and passage 35. Actuation of control valve 14, i.e.
  • the axially movable control valve housing 17 is connected via an elastic reaction disc 19 to a push rod 18.
  • Push rod 18 acts on an actuating piston of the master cylinder of the brake unit.
  • transmitting sleeves 20 At its end close to low-pressure chamber 4, transmitting sleeves 20 has a flange-like collar 22 which engages behind movable wall 2 and is secured thereto by means of a prop ring 23.
  • Prop ring 23 is connected to the diaphragm plate of movable wall 2 via a snap-in connection 24 (FIG. 2).
  • prop ring 23 serves for fastening a rolling diaphragm 25 which forms a movable seal between wall 2 and reinforcement tube 5.
  • a cylindrical inner section 29 of prop ring 23 forms a support for the rolled fold of rolling diaphragm 25.
  • the snap-in connection 24 (FIG. 2) is established by resilient loops 24' at the prop ring 23. As is indicated in FIG. 2 by dotted lines, loops 24' are able to spring outwardly (towards the center line of the booster) permitting hooks 2' connected to movable wall 2 to be introduced until the resilient loops 24' skip hooks 2' and take the position shown in FIG. 2 by solid lines, with the hooks 2' of the movable wall 2 being held captive.
  • control valve housing 17 Provided as a seal between control valve housing 17 and reinforcement tube 5 is a pleated bellows 27 which may be replaced by a rolling diaphragm or a slide seal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)
US06/278,134 1980-08-07 1981-06-29 Brake booster Expired - Fee Related US4393750A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3029911 1980-08-07
DE19803029911 DE3029911A1 (de) 1980-08-07 1980-08-07 Bremskraftverstaerker fuer kraftfahrzeuge

Publications (1)

Publication Number Publication Date
US4393750A true US4393750A (en) 1983-07-19

Family

ID=6109093

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/278,134 Expired - Fee Related US4393750A (en) 1980-08-07 1981-06-29 Brake booster

Country Status (6)

Country Link
US (1) US4393750A (it)
JP (1) JPS6050616B2 (it)
DE (1) DE3029911A1 (it)
FR (1) FR2488203A2 (it)
GB (1) GB2081403B (it)
IT (1) IT1137626B (it)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4475444A (en) * 1983-04-21 1984-10-09 The Bendix Corporation Brake apparatus
US4499812A (en) * 1982-10-29 1985-02-19 Societe Anonyme D.B.A. Servo-motor for power-assisted braking
US5088386A (en) * 1989-11-30 1992-02-18 Bendix Europe Services Techniques Pneumatic brake booster
US20150344016A1 (en) * 2013-01-22 2015-12-03 Continental Teves Ag & Co. Ohg Holding assembly
KR20180029032A (ko) * 2015-07-10 2018-03-19 콘티넨탈 테베스 아게 운트 코. 오하게 오목형 베어링 표면을 갖는 공압식 브레이크 부스터

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3411027C2 (de) * 1984-03-24 1996-04-25 Teves Gmbh Alfred Vakuumbremskraftverstärker
DE3439734A1 (de) * 1984-10-31 1986-04-30 FAG Kugelfischer Georg Schäfer KGaA, 8720 Schweinfurt Membranteller fuer unterdruckbremskraftverstaerker
DE3709172A1 (de) * 1987-03-20 1988-09-29 Teves Gmbh Alfred Vakuumbremskraftverstaerker fuer kraftfahrzeuge und verfahren zu dessen herstellung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3645547A (en) * 1969-02-07 1972-02-29 Hepworth Iron Co Ltd Pipe couplings
DE2922299A1 (de) * 1978-05-31 1979-12-06 Tokico Ltd Pneumatischer kraftverstaerker
GB2037918A (en) * 1978-12-12 1980-07-16 Lucas Industries Ltd Boosted master cylinder assemblies for vehicle braking systems
GB2040376A (en) * 1978-08-31 1980-08-28 Teves Gmbh Alfred Brake booster
GB2053395A (en) * 1979-07-06 1981-02-04 Lucas Industries Ltd Servo booster for a vehicle braking system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA794398B (en) * 1978-09-01 1980-08-27 Lucas Industries Ltd Servo boosters for vehicle braking systems
ZA796067B (en) * 1978-11-21 1980-10-29 Lucas Industries Ltd Servo boosters for vehicle braking systems
DE2908516A1 (de) * 1979-03-05 1980-10-16 Teves Gmbh Alfred Bremskraftverstaerker fuer ein kraftfahrzeug
DE2918913A1 (de) * 1979-05-10 1981-04-09 Alfred Teves Gmbh, 6000 Frankfurt Bremskraftverstaerker
DE2918909C2 (de) * 1979-05-10 1987-01-02 Alfred Teves Gmbh, 6000 Frankfurt Mechanisch gesteuerter Kraftverstärker, insbesondere für Bremsanlagen von Kraftfahrzeugen
DE2918910A1 (de) * 1979-05-10 1980-12-04 Teves Gmbh Alfred Bremskraftverstaerker
DE3012454C2 (de) * 1980-03-31 1987-04-23 Alfred Teves Gmbh, 6000 Frankfurt Mechanisch gesteuerter Bremskraftverstärker, insbesondere für Kraftfahrzeuge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3645547A (en) * 1969-02-07 1972-02-29 Hepworth Iron Co Ltd Pipe couplings
DE2922299A1 (de) * 1978-05-31 1979-12-06 Tokico Ltd Pneumatischer kraftverstaerker
GB2040376A (en) * 1978-08-31 1980-08-28 Teves Gmbh Alfred Brake booster
GB2037918A (en) * 1978-12-12 1980-07-16 Lucas Industries Ltd Boosted master cylinder assemblies for vehicle braking systems
GB2053395A (en) * 1979-07-06 1981-02-04 Lucas Industries Ltd Servo booster for a vehicle braking system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4499812A (en) * 1982-10-29 1985-02-19 Societe Anonyme D.B.A. Servo-motor for power-assisted braking
US4475444A (en) * 1983-04-21 1984-10-09 The Bendix Corporation Brake apparatus
US5088386A (en) * 1989-11-30 1992-02-18 Bendix Europe Services Techniques Pneumatic brake booster
US20150344016A1 (en) * 2013-01-22 2015-12-03 Continental Teves Ag & Co. Ohg Holding assembly
US11091140B2 (en) * 2013-01-22 2021-08-17 Continental Teves Ag & Co., Ohg Holding assembly
KR20180029032A (ko) * 2015-07-10 2018-03-19 콘티넨탈 테베스 아게 운트 코. 오하게 오목형 베어링 표면을 갖는 공압식 브레이크 부스터

Also Published As

Publication number Publication date
IT1137626B (it) 1986-09-10
GB2081403B (en) 1984-05-23
GB2081403A (en) 1982-02-17
FR2488203B2 (it) 1985-02-22
IT8123187A0 (it) 1981-07-28
DE3029911C2 (it) 1990-10-25
DE3029911A1 (de) 1982-03-11
FR2488203A2 (fr) 1982-02-12
JPS6050616B2 (ja) 1985-11-09
JPS5755251A (en) 1982-04-02

Similar Documents

Publication Publication Date Title
US4450688A (en) Brake booster for automotive vehicles
US4325218A (en) Vacuum brake booster
US4330996A (en) Vacuum brake booster
US3312147A (en) Fluid pressure servomotor
US5090298A (en) Brake booster with sealed passage for mounting
US4394833A (en) Brake booster
GB2031086A (en) Brake boosters
US4393750A (en) Brake booster
US4347779A (en) Vacuum brake booster
JPS5996049A (ja) 動力援助ブレ−キ装置用サ−ボモ−タ
US4328738A (en) Vacuum servo booster
US4543790A (en) Master cylinder and brake booster assembly
US4345506A (en) Vacuum type booster
US4409885A (en) Brake booster
US3420145A (en) Fluid pressure servomotor
US5680807A (en) Vacuum brake booster for motor vehicles
GB2082275A (en) Brake Booster
JPH023566A (ja) 自動車用タンデム型ブレーキパワーブースタ
US4416191A (en) Vacuum booster device
US5711203A (en) Pneumatic brake booster
EP0009393B1 (en) Pneumatic force multiplying device
JPH0110291Y2 (it)
JPS623327Y2 (it)
EP0573234B1 (en) Improvements in pneumatically-operated boosters for vehicle braking systems
US4474103A (en) Brake boosters

Legal Events

Date Code Title Description
AS Assignment

Owner name: ITT INDUSTRIES, INC., 320 PARK AVENUE, NEW YORK, N

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WAGNER, WILFRIED;REEL/FRAME:003898/0075

Effective date: 19810619

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, PL 96-517 (ORIGINAL EVENT CODE: M170); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 4

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 8TH YEAR, PL 96-517 (ORIGINAL EVENT CODE: M171); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 8

FEPP Fee payment procedure

Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19950719

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362